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This week, these five stocks have the worst ratings in Earnings Growth, one of the eight Fundamental Categories on Portfolio Grader.

TransAlta (NYSE:TAC) operates as a wholesale power generator and marketer in Canada, the United States and Australia. TAC gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity, Cash Flow, Operating Margin Growth, and Sales Growth as well. Shares of the stock have declined 25.7% since January 1. This is worse than the S&P 500, which has seen a 12.3% increase over the same period. For more information, get Portfolio Grader’s complete analysis of TAC stock.

ReneSola (NYSE:SOL) develops, manufactures and sells solar wafers, which are thin sheets of crystalline silicon material mainly made by slicing monocrystalline or multicrystalline ingots. SOL gets F’s in Equity, Cash Flow, and Operating Margin Growth as well. The price of SOL is down 16% since the first of the year. For more information, get Portfolio Grader’s complete analysis of SOL stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.